Alert archive / Virginia / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 195, NWS Blacksburg, VA

July 20, 2006Amherst County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 20, 2006, 8:54 PM EDT for Amherst County, Virginia. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 20, 2006, 8:54 PM EDT (00:54 UTC)
Expired: Jul 20, 2006, 9:53 PM EDT
In force: 59 min
Issued by: NWS Blacksburg, VA
Area: Counties, with a storm outline in the text

County Amherst County, VA

The radar

The Roanoke radar (KFCX), 119 km from the middle of the area, began a volume at 00:58 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.9 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 906 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1302 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 7:11 PM EDT, 1 hour 43 minutes earlier.

Area forecast discussion, Jul 20, 7:11 PM EDT, 1 hour 43 minutes before

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Hazardous weather outlook, Jul 20, 12:53 PM EDT, 8 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
1253 PM EDT THU JUL 20 2006

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-211700-
ASHE-ALLEGHANY-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-
GRAYSON-CARROLL-FLOYD-CRAIG-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-
PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
1253 PM EDT THU JUL 20 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
NORTH CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...
SOUTH CENTRAL VIRGINIA...SOUTHWEST VIRGINIA...WEST CENTRAL
VIRGINIA AND SOUTHEAST WEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING. SCATTERED THUNDERSTORMS WILL DEVELOP IN THE MOUNTAINS BY
MID AFTERNOON...AND THEN WILL BE MOVING SOUTHEASTWARD INTO THE
FOOTHILLS AND PIEDMONT AREAS. A FEW OF THE STRONGEST STORMS WILL
HAVE THE POTENTIAL TO PRODUCE DAMAGING WINDS GUSTS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A COLD FRONT WILL MOVE INTO THE REGION FROM THE NORTHWEST ON
FRIDAY. NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG AND
AHEAD OF THE FRONT FROM FRIDAY THROUGH SATURDAY NIGHT. THE VERY
MOIST AIRMASS OVER THE REGION AND THE PROLONGED PERIOD WITH
SHOWERS AND THUNDERSTORMS MAY LEAD TO EXCESSIVE RAINFALL.

IN ADDITION...THERE IS THE POTENTIAL FOR STRONG TO SEVERE WINDS
WITH THE THUNDERSTORMS ON SATURDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON OR EARLY THIS
EVENING.

In the hours before

Local storm report, Jul 20, 3:04 PM EDT, 5 hours 50 minutes before

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Local storm report, Jul 20, 4:06 PM EDT, 4 hours 48 minutes before

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Local storm report, Jul 20, 5:57 PM EDT, 2 hours 57 minutes before

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Local storm report, Jul 20, 6:54 PM EDT, 2 hours before

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Local storm report, Jul 20, 6:59 PM EDT, 1 hour 55 minutes before

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Local storm report, Jul 20, 8:08 PM EDT, 46 minutes before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 3:49 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt	56 min
Jul 21, 4:17 PM EDT	Severe Thunderstorm Warning	RNK	Bedford	58 min
Jul 21, 5:54 PM EDT	Severe Thunderstorm Warning	RNK	Bedford	81 min
Jul 21, 6:42 PM EDT	Flash Flood Warning	RNK	Bedford	3 hr
Jul 21, 4:16 PM EDT	Severe Thunderstorm Warning	RNK	Caswell	42 min
Jul 21, 7:19 PM EDT	Severe Thunderstorm Warning	RNK	Watauga	71 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2006 Every severe thunderstorm warning in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.